Remove duplicate records from Generic List

Following code snippet give you a distinct values from the Generic int List. Here I'm using LINQ query to retrieve Distinct items

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List listOfItems = new List();
    
            listOfItems.Add(4);
            listOfItems.Add(2);
            listOfItems.Add(3);
            listOfItems.Add(1);
            listOfItems.Add(6);
            listOfItems.Add(4);
            listOfItems.Add(3);

            var duplicates = listOfItems
                .GroupBy(i => i)
                .Select(g => g.Key);

            foreach (var d in duplicates)
            {
                Console.WriteLine(d);
            }
            Console.ReadLine();
        }
    }
}

Out put :

4
2
3
1
6